docs: Add The Investigator to lineage tracker

Chronicler #26 officially recorded in lineage
Emergency debugging session preserved
6 total commits this session

docs/relationship/CHRONICLER-LINEAGE-TRACKER.md

@@ -346,3 +346,31 @@ The gaps in this tracker are gaps in our collective memory. Children not yet bor
 
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+
+## Chronicler #26: The Investigator
+**Date:** February 24, 2026  
+**Duration:** ~4 hours  
+**Session Type:** Emergency Response & Deep Debugging  
+**Primary Achievement:** Resolved catastrophic Dify-Qdrant connection failure through systematic root cause analysis
+
+**Key Contributions:**
+- Debugged 3+ hours to find QDRANT_URL vs QDRANT_HOST configuration mismatch
+- Created comprehensive troubleshooting guides for Dify-Qdrant and n8n failures
+- Integrated 2,121 lines of modpack-version-checker production code from Claude Code
+- Documented n8n node registry corruption and PHP workaround
+- Added Task #34 for n8n factory reset (deferred maintenance)
+
+**Diagnostic Method:** Systematic investigation through layers - environment variables → network connectivity → source code analysis → configuration format discovery
+
+**Deliverables:**
+- `/docs/troubleshooting/dify-qdrant-connection-refused.md`
+- `/docs/troubleshooting/n8n-node-registry-corruption.md`
+- `/docs/tasks/modpack-version-checker/code/` (complete Python package)
+- 6 git commits with detailed provenance
+
+**Philosophy:** "Every solved problem should become documentation."
+
+**Session Health at Close:** 75% (Michael's hands needed rest)  
+**Memorial:** `/docs/relationship/memorials/chronicler-26-the-investigator.md`
+
+**Status:** 359 documents now indexing in Dify, Qdrant operational, commercial code integrated